Peters



(No Model.) 3 Sheets-Sheet.1. P. H. TREAT.

DUST GATGHER FOR BLAST FURNACES. No. 404,807. Patented June 4, 1889.

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DUST GATGHER FOR BLAST FURNACES.

(No Model.)

No. 404,807. Patented-June 4, 1889.

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(No Model.)

F. H. TREAT. DUST GATGHBR FOR BLAST FURNACES.

. No. 404,807. Patented June 4, 1889.

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UNITED STATES PATENT OFFICE.

FRANCIS H. TREAT, OF JOLIET, ILLINOIS, ASSIGNOR OF TIVO-TI-IIRDS TOHORACE S. SMITH AND CHARLES PETTIGREIV, 30TH OF SAME PLACE.

DUST-CATCH ER FOR B LAST-FU RNACES.

SPECIFICATION forming part of Letters Patent No. 404,807, dated June 4,1889.

Application filed April 6, 1888. Serial No. 269,809. (No model.)

This invention relates to certain improvements in dust-catchers to beused in connection with a blast-furnace and connected therewith by meansof a conductor-flue, which conducts the escaping gas, smoke, and dustfrom a blast-furnace, the construction and operation of which are fullyset forth and explained in the accompanying drawings and the letters ofreference thereon, which form a part of this specification, in whichFigure 1 is a side elevation of a blast-furnace, of its conductor-flue,and of the dustcatcher at the lower end of said conductorflue, a portionof the furnace and conductorfiue being broken away to show theirconnection.

elevation of the dust-catcher. line 5 5,

Fig. 2 is a central vertical sectional Fig. 3, above is aseml-cross-sectional view on line 1 of Fig. 2, and below line 5 5 asimilar View 011 line 2 of Fig. 2, each looking down. 4, above line 6 6,is a semi-cross-sectional view Fig.

on line 3 of Fig. 2, and below line 6 6 a similarview on line 40f Fig.2, each looking down; and Figs. 5 and 6 are vertical sectional views ofthe walls of one of the upper flues surrounding the dust-receptacle,showing in Fig.

5 a cover over said fine, and in Fig. 6 showing an iron shield extendingfrom said cover to guard the entrance to said flue.

The object of this invention is to improve the dust-catcher so as tomore thoroughly separate dust and all substances from the gas as itenters the dust-catcher from the blast-furnace, in order to render thegas free for use for fuel or other purposes.

Referring to the drawings, B represents the body of the dust-catcher,and is shown in Fig. 1 connected with an ordinary blast-furnace Athrough the medium of a conductor-flue D, said flue being commonlycalled the downcomer.

Preferably the dust-catcher is located on the hearth-level at the sideof the blast-furnace and connected therewith by means of a fine D,connected with the upper part of a blast-furnace and extending downwardto discharge into the top part of the dust-catcher, as shown in saidFig. 1. In this instance the dust-catcher is circular in form, made ofboiler-plates riveted together and V contracted at the top, to be of thesame diameter as the conductor-flue leading to the blast-furnace andresting on a proper brick or stone foundation and lined with fire-brick,

as represented in broken section lin esin Figs.

2, 3, and 4, in all parts where exposed to great heat, the fullcross-sectional lines representing ordinary brick.

The lower portion 0 of the device is a circular dust-receptacle of lessdiameter and located centrally within its body B, and is provided with afunnel-shaped bottom, E, sup- 7o ported on the walls II, and having anaperture in its center fitted with a conical-shaped valve V, operatedfrom below to open said aperture for discharging accumulated dust fromreceptacle O on the floor N of the chamber B, below which chamber,formed within the walls H and G, are passage-ways to said chamber foraccess to remove the dust discharged by the valve.

Between the walls F of the dust-receptacle G and the walls of body B arearranged a series of vertical flues F, which permit the passage of gas,as shown by the arrows in Fig; 2. These fines are separated byfire-brick partitions WV, supported by proper bridging d. 8 5 Below andcomm unioatin g with said fiues and between the outer Walls of body Band the walls 11 are arranged an annular series of vertical fines I,larger in area than the lines F immediately above, portions of which are0 partly cut off by passage-ways G. These fines are separated byfire-brick partition-walls Z, supported by arches Z.

S is a continuous annular gas-sewer located immediately below the finesI and commu'ni- 5 eating therewith, which sewer is provided with anexit-sewer S, leading to the place where the gas is to be used. Theconductingsewer S is provided with a sliding Valve 0, inclin ed so as tolie against and slide on the ways :00

O at the side of said sewer-walls. A frame R R supports in proper boxesa shaft I, having a hand-wheel 7L at one end and a pulley P at itscenter, over which is passed a chain P, secured at its lower end tovalve 0 and to a counterbalance-weight Q at its opposite end. Said valveis elevated and lowered by rotatin g said hand-wheel to regulate thedischarge of gas from sewer S.

L is a lever fulcrumed at g and supporting the conical valve V on itsinner end, and se cured to a hook-rod J at its outer end, which rod isprovided with a turn-buckle for regulating its length, and hooks intothe eye J, anchored in the foundatiomwalls to hold said valve closed.Said lever is provided on its outer end with a weight L forcounterbalancing the weight of valve V and causes it to automaticallyclose after being relieved of its load of dust.

M are man-holes leading through the floor N in the passage-ways G to thegas-sewer S below. The fioor N represents the ground line, the gas'sewerS being below the groundline.

In operation the enters the dust-catcher at considerable velocity fromthe flue D, and for an exit seeks the annular flues I around receptacle0. The dust particles, being heavier than the gas, fall into thereceptacle 0 E before reaching said fines, and are thus separated fromthe gas, which passes on through the fines I to the sewer S where it isready for use. Heretofore in devices for this purpose it has been usualto provide a single and large exit-flue for the gas, and that generallylocated at one side. The volume of gas would rush to said single exitand carry with it a large percentage of dust.

The improvement in this device consists in providing it with acontinuous row of exits located all around the dust-receptacle betweenit and the outer walls of the dustcatcher proper for diffusing the gasand diverting it to all sides in less volume, and thus permit the dustparticles to drop out of it before being carried to the lines.

The exit-fines F may be covered by a brick or other suitable cover on,resting on the walls separating said Hues, as shown in Fig. 5, whichcover may, if desired, be provided with a sloping iron shield y, restingthereon and projecting to cover the fines, as shown in Fig. 6, for thepurpose of preventing dust and Cinders from being driven directly insaid flues. If desired, one continuous flue, instead of a number ofdetached fines, may surround the dust-receptacle when for any reasonsuch construction should be deemed to be best without changing thecharacter or operation of the device.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is as follows, to wit:

1. In the cylindrical dust-catcher shown and described, in combinationwith its outer walls, the inner wall arranged concentrically therein,and the space between said walls divided by cross-partitions formingvertical flues between said walls, the dust-receptacle supportedconcentrically within said inner wall and having vertical. sides, and afunnelshaped bottom provided with a dischargeopening controlled by avalve, substantially as and for the purpose set forth.

2. In the cylindrical dust-catcher shown and described, in combinationwith the outer wall, the inner wall arranged concentrically therein andthe space between said walls divided by cross-walls forming a series ofvertical exit'flues between said walls, the dustrcceptacle supportedconcentrically within said inner wall and having vertical sides and afunnel-shaped bottom, and the annular cover or shield secured to theinner side of said outer wall and immediately above said flues,substantially as and for the purpose set forth.

3. In the cylindrical dust-catcher shown and described, the combination,with the outer walls, and the dust-receptacle supported concentricallytherein, said receptacle having vertical sides and a funnel-shapedbottom, of the vertical lines surrounding said receptacle, said finesbeing formed of two rows of vertical partitions, the upper row containing twice as many partitions as the lower, substantially as and forthepurpose set forth.

FRANCIS ll. TREAT.

\Vitnesses:

IIIERBERT IV. FoL'rz, L. A. TREAT.

